The thyroid is typically only checked with the Thyroid Stimulating Hormone (TSH) level. This is sufficient if one is only looking at the general overview of what the thyroid is doing. However, an in depth evaluation reveals how well the body is converting the T4 released by the thyroid to T3. T3 is the active component of thyroid. It’s what makes 220 different things work in the body. When the body is deficient in certain nutrients, it does not convert the T4 to T3 very well. An in depth thyroid evaluation can help determine if nutrients are needed to help with the conversion or if one needs T3 to help the body function better.